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<title>&lt;ctype.h&gt;</title>
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The Single UNIX &reg; Specification, Version 2<br>
Copyright &copy; 1997 The Open Group

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<h4><a name = "tag_000_002_074">&nbsp;</a>NAME</h4><blockquote>
ctype.h - character types
</blockquote><h4><a name = "tag_000_002_075">&nbsp;</a>SYNOPSIS</h4><blockquote>
<pre><code>

#include &lt;ctype.h&gt;
</code>
</pre>
</blockquote><h4><a name = "tag_000_002_076">&nbsp;</a>DESCRIPTION</h4><blockquote>
The
<i>&lt;ctype.h&gt;</i>
header
declares the following as functions and may also define them as macros.
Function prototypes must be provided for use with an ISO C
compiler.
<pre>
<code>
int   <a href="isalnum.html">isalnum</a>(int);
int   <a href="isalpha.html">isalpha</a>(int);
int   <a href="isascii.html">isascii</a>(int);
int   <a href="iscntrl.html">iscntrl</a>(int);
int   <a href="isdigit.html">isdigit</a>(int);
int   <a href="isgraph.html">isgraph</a>(int);
int   <a href="islower.html">islower</a>(int);
int   <a href="isprint.html">isprint</a>(int);
int   <a href="ispunct.html">ispunct</a>(int);
int   <a href="isspace.html">isspace</a>(int);
int   <a href="isupper.html">isupper</a>(int);
int   <a href="isxdigit.html">isxdigit</a>(int);
int   <a href="toascii.html">toascii</a>(int);
int   <a href="tolower.html">tolower</a>(int);
int   <a href="toupper.html">toupper</a>(int);
</code>
</pre>
<p>
The following are defined as macros:
<pre>
<code>
int   <a href="_toupper.html">_toupper</a>(int);
int   <a href="_tolower.html">_tolower</a>(int);
</code>
</pre>
</blockquote><h4><a name = "tag_000_002_077">&nbsp;</a>APPLICATION USAGE</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_002_078">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_002_079">&nbsp;</a>SEE ALSO</h4><blockquote>
<i><a href="isalnum.html">isalnum()</a></i>,
<i><a href="isalpha.html">isalpha()</a></i>,
<i><a href="isascii.html">isascii()</a></i>,
<i><a href="iscntrl.html">iscntrl()</a></i>,
<i><a href="isdigit.html">isdigit()</a></i>,
<i><a href="isgraph.html">isgraph()</a></i>,
<i><a href="islower.html">islower()</a></i>,
<i><a href="isprint.html">isprint()</a></i>,
<i><a href="ispunct.html">ispunct()</a></i>,
<i><a href="isspace.html">isspace()</a></i>,
<i><a href="isupper.html">isupper()</a></i>,
<i><a href="isxdigit.html">isxdigit()</a></i>,
<i><a href="mblen.html">mblen()</a></i>,
<i><a href="mbstowcs.html">mbstowcs()</a></i>,
<i><a href="mbtowc.html">mbtowc()</a></i>,
<i><a href="setlocale.html">setlocale()</a></i>,
<i><a href="toascii.html">toascii()</a></i>,
<i><a href="tolower.html">tolower()</a></i>,
<i><a href="_tolower.html">_tolower()</a></i>,
<i><a href="toupper.html">toupper()</a></i>,
<i><a href="_toupper.html">_toupper()</a></i>,
<i><a href="wcstombs.html">wcstombs()</a></i>,
<i><a href="wctomb.html">wctomb()</a></i>,
<i><a href="locale.h.html">&lt;locale.h&gt;</a></i>.
</blockquote><hr size=2 noshade>
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UNIX &reg; is a registered Trademark of The Open Group.<br>
Copyright &copy; 1997 The Open Group
<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]

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